Localization-enhanced moiré exciton in twisted transition metal dichalcogenide heterotrilayer superlattices
Abstract The stacking of twisted two-dimensional (2D) layered materials has led to the creation of moiré superlattices, which have become a new platform for the study of quantum optics. The strong coupling of moiré superlattices can result in flat minibands that boost electronic interactions and gen...
| Main Authors: | , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Publishing Group
2023-05-01
|
| Series: | Light: Science & Applications |
| Online Access: | https://doi.org/10.1038/s41377-023-01171-w |
| _version_ | 1827947931522564096 |
|---|---|
| author | Haihong Zheng Biao Wu Shaofei Li Junnan Ding Jun He Zongwen Liu Chang-Tian Wang Jian-Tao Wang Anlian Pan Yanping Liu |
| author_facet | Haihong Zheng Biao Wu Shaofei Li Junnan Ding Jun He Zongwen Liu Chang-Tian Wang Jian-Tao Wang Anlian Pan Yanping Liu |
| author_sort | Haihong Zheng |
| collection | DOAJ |
| description | Abstract The stacking of twisted two-dimensional (2D) layered materials has led to the creation of moiré superlattices, which have become a new platform for the study of quantum optics. The strong coupling of moiré superlattices can result in flat minibands that boost electronic interactions and generate interesting strongly correlated states, including unconventional superconductivity, Mott insulating states, and moiré excitons. However, the impact of adjusting and localizing moiré excitons in Van der Waals heterostructures has yet to be explored experimentally. Here, we present experimental evidence of the localization-enhanced moiré excitons in the twisted WSe2/WS2/WSe2 heterotrilayer with type-II band alignments. At low temperatures, we observed multiple excitons splitting in the twisted WSe2/WS2/WSe2 heterotrilayer, which is manifested as multiple sharp emission lines, in stark contrast to the moiré excitonic behavior of the twisted WSe2/WS2 heterobilayer (which has a linewidth 4 times wider). This is due to the enhancement of the two moiré potentials in the twisted heterotrilayer, enabling highly localized moiré excitons at the interface. The confinement effect of moiré potential on moiré excitons is further demonstrated by changes in temperature, laser power, and valley polarization. Our findings offer a new approach for localizing moiré excitons in twist-angle heterostructures, which has the potential for the development of coherent quantum light emitters. |
| first_indexed | 2024-04-09T12:46:31Z |
| format | Article |
| id | doaj.art-b6b67a9ba53e45468ef7823f743bc2cc |
| institution | Directory Open Access Journal |
| issn | 2047-7538 |
| language | English |
| last_indexed | 2024-04-09T12:46:31Z |
| publishDate | 2023-05-01 |
| publisher | Nature Publishing Group |
| record_format | Article |
| series | Light: Science & Applications |
| spelling | doaj.art-b6b67a9ba53e45468ef7823f743bc2cc2023-05-14T11:28:20ZengNature Publishing GroupLight: Science & Applications2047-75382023-05-011211910.1038/s41377-023-01171-wLocalization-enhanced moiré exciton in twisted transition metal dichalcogenide heterotrilayer superlatticesHaihong Zheng0Biao Wu1Shaofei Li2Junnan Ding3Jun He4Zongwen Liu5Chang-Tian Wang6Jian-Tao Wang7Anlian Pan8Yanping Liu9School of Physics and Electronics, Hunan Key Laboratory for Super-microstructure and Ultrafast Process, Central South UniversitySchool of Physics and Electronics, Hunan Key Laboratory for Super-microstructure and Ultrafast Process, Central South UniversitySchool of Physics and Electronics, Hunan Key Laboratory for Super-microstructure and Ultrafast Process, Central South UniversitySchool of Physics and Electronics, Hunan Key Laboratory for Super-microstructure and Ultrafast Process, Central South UniversitySchool of Physics and Electronics, Hunan Key Laboratory for Super-microstructure and Ultrafast Process, Central South UniversitySchool of Chemical and Biomolecular Engineering, The University of SydneyBeijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of SciencesBeijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of SciencesHunan Institute of Optoelectronic Integration, College of Materials Science and Engineering, Hunan UniversitySchool of Physics and Electronics, Hunan Key Laboratory for Super-microstructure and Ultrafast Process, Central South UniversityAbstract The stacking of twisted two-dimensional (2D) layered materials has led to the creation of moiré superlattices, which have become a new platform for the study of quantum optics. The strong coupling of moiré superlattices can result in flat minibands that boost electronic interactions and generate interesting strongly correlated states, including unconventional superconductivity, Mott insulating states, and moiré excitons. However, the impact of adjusting and localizing moiré excitons in Van der Waals heterostructures has yet to be explored experimentally. Here, we present experimental evidence of the localization-enhanced moiré excitons in the twisted WSe2/WS2/WSe2 heterotrilayer with type-II band alignments. At low temperatures, we observed multiple excitons splitting in the twisted WSe2/WS2/WSe2 heterotrilayer, which is manifested as multiple sharp emission lines, in stark contrast to the moiré excitonic behavior of the twisted WSe2/WS2 heterobilayer (which has a linewidth 4 times wider). This is due to the enhancement of the two moiré potentials in the twisted heterotrilayer, enabling highly localized moiré excitons at the interface. The confinement effect of moiré potential on moiré excitons is further demonstrated by changes in temperature, laser power, and valley polarization. Our findings offer a new approach for localizing moiré excitons in twist-angle heterostructures, which has the potential for the development of coherent quantum light emitters.https://doi.org/10.1038/s41377-023-01171-w |
| spellingShingle | Haihong Zheng Biao Wu Shaofei Li Junnan Ding Jun He Zongwen Liu Chang-Tian Wang Jian-Tao Wang Anlian Pan Yanping Liu Localization-enhanced moiré exciton in twisted transition metal dichalcogenide heterotrilayer superlattices Light: Science & Applications |
| title | Localization-enhanced moiré exciton in twisted transition metal dichalcogenide heterotrilayer superlattices |
| title_full | Localization-enhanced moiré exciton in twisted transition metal dichalcogenide heterotrilayer superlattices |
| title_fullStr | Localization-enhanced moiré exciton in twisted transition metal dichalcogenide heterotrilayer superlattices |
| title_full_unstemmed | Localization-enhanced moiré exciton in twisted transition metal dichalcogenide heterotrilayer superlattices |
| title_short | Localization-enhanced moiré exciton in twisted transition metal dichalcogenide heterotrilayer superlattices |
| title_sort | localization enhanced moire exciton in twisted transition metal dichalcogenide heterotrilayer superlattices |
| url | https://doi.org/10.1038/s41377-023-01171-w |
| work_keys_str_mv | AT haihongzheng localizationenhancedmoireexcitonintwistedtransitionmetaldichalcogenideheterotrilayersuperlattices AT biaowu localizationenhancedmoireexcitonintwistedtransitionmetaldichalcogenideheterotrilayersuperlattices AT shaofeili localizationenhancedmoireexcitonintwistedtransitionmetaldichalcogenideheterotrilayersuperlattices AT junnanding localizationenhancedmoireexcitonintwistedtransitionmetaldichalcogenideheterotrilayersuperlattices AT junhe localizationenhancedmoireexcitonintwistedtransitionmetaldichalcogenideheterotrilayersuperlattices AT zongwenliu localizationenhancedmoireexcitonintwistedtransitionmetaldichalcogenideheterotrilayersuperlattices AT changtianwang localizationenhancedmoireexcitonintwistedtransitionmetaldichalcogenideheterotrilayersuperlattices AT jiantaowang localizationenhancedmoireexcitonintwistedtransitionmetaldichalcogenideheterotrilayersuperlattices AT anlianpan localizationenhancedmoireexcitonintwistedtransitionmetaldichalcogenideheterotrilayersuperlattices AT yanpingliu localizationenhancedmoireexcitonintwistedtransitionmetaldichalcogenideheterotrilayersuperlattices |